For a long time, phase arrays have been used in a variety of wave transmission applications because of their simplicity and versatility. Conventionally, there is a trade-off between the compactness of a phase array and its directivity. In this paper, we demonstrate how by embedding a normal phase array within a superlens (made of negative refractive index material) we can overcome this constrai...

We consider closed free tensionless strings in AdSd, calculate exactly the boundary/boundary string evolution kernel and find the string dynamics to be completely frozen. We interpret therefore the boundary configurations as Wilson loop operators in a confining phase. This is taken as an argument in favor to the dual weakly coupled abelian gauge theory being that of (d− 4)-forms in the (d− 1) d...

Multi-phase machines are considered serious contenders as compared to the three phase machines for variable applications in generating mode. This paper presents the transient performance analysis of a multi-phase induction machine operating in six-phase mode for power generation. In this paper the simulation and experimental analysis of a six-phase machine in generating mode have been made. The...

As eGovernment is gaining popularity in administrations, business and with citizen, issues about the course of its evolution take center stage. This evolution is generally seen as a four-step process: presence phase, interaction phase, transaction phase and transformation phase. To date few countries have made a significant progress in the last transformation phase whose goal is to integrate se...

We investigate the relation between measurements and the physical observables for vacuum spacetimes with compact spatial surfaces in (2+1)-gravity with vanishing cosmological constant. By considering an observer who emits lightrays that return to him at a later time, we obtain explicit expressions for several measurable quantities as functions on the physical phase space of the theory: the eige...

We have investigated the dynamics of superfluid phase slippage in an array of apertures. The magnitude of the dissipative phase slips shows that they occur simultaneously in all the apertures when the temperature is near T!−T#10 mK and subsequently lose their simultaneity as the temperature is lowered. We describe three experiments to probe the mechanisms underlying the synchronous behavior. Th...

We give a survey on double-loop networks with emphasis on new development since the surveys in 1986, 1991 and 1995. c © 2001 Elsevier Science B.V. All rights reserved.

In this paper a new variety of the digitized version of an analog phase locked loop has been proposed in order to overcome the conditionally stable nature of a software controlled phase locked loop. Also the conventional need of a low pass filter to filter out the high frequency components at the output of a phase detector is avoided through the use of In-phase and Quadrature signals. MATLAB si...